The gauge plastic slips forward with chair movement forward and back to the point where it hits the Base of the desk unit and curves upward. Did try a piece with tentacles that grip carpet but gauge of plastic was too thin and constantly took impressions from the chair legs. Adequate.
The plastic chair mat I purchased allows the wheels of my desk chair to move more easily than when the wheels were trying to move on carpet without a mat. I purchased a thinner less expensive mat at Staples even though a thicker mat was offered. I will probably return and purchase the thicker mat because I am not satisfied with the results of using the thinner one.